OpenAI previews ‘Ultrafast’ GPT-5.6 Sol running up to 14 times faster

OpenAI is previewing a new Ultrafast service tier that runs its GPT-5.6 Sol model up to 14 times faster than standard processing, generating up to 750 output tokens per second via Cerebras hardware. The tier launches first through the OpenAI API and is aimed at latency-sensitive tasks such as voice, customer support, commerce, developer agents, financial research, and security response, with access limited to select customers while OpenAI evaluates capacity.

OpenAI is previewing a new way to run its most capable GPT-5.6 model at dramatically higher speeds. The company says its new Ultrafast service tier can run GPT-5.6 Sol up to 14 times faster than standard processing. Ultrafast mode https://openai.com/index/previewing-ultrafast/ launches first through the OpenAI API and is powered by Cerebras. It can generate up to 750 output tokens per second, potentially bringing frontier-level performance to workflows where latency matters as much as model intelligence. OpenAI introduced GPT-5.6 Sol in June https://9to5mac.com/2026/06/26/openai-upgrading-chatgpt-and-codex-with-new-gpt-5-6-models-in-limited-release/ alongside the balanced Terra and speed-focused Luna models. The full family became broadly available in July https://9to5mac.com/2026/07/09/openai-announcing-the-next-chapter-for-chatgpt-today-watch-here/ , including through ChatGPT, Codex, and the API. The company sees Ultrafast supporting live or near-production tasks including voice, customer support, commerce, developer agents, financial research, and security response. OpenAI says its own developers have used it to analyze logs and traces during incidents, as well as compress research cycles that previously ran overnight into multiple iterations during the workday. Access remains limited to a select group of customers while OpenAI evaluates how the added speed changes real-world products and expands capacity. Businesses can join the Ultrafast waitlist https://openai.com/form/ultrafast/ by sharing their workload, latency requirements, expected usage, and other details. Do more with your Apple products Apple AirTag 2 | Add Find My tracking to keys, bags, bikes, more https://amzn.to/4vjNWN1 AirPods 4 | Apple’s newest wireless headphones https://amzn.to/43ndewV AirPods Pro 3 | Apple’s best wireless headphones https://amzn.to/4ut3FYp Beats USB-A to USB-C Cable | The official CarPlay cable https://amzn.to/4mpKs7K FTC: We use income earning auto affiliate links. More. https://9to5mac.com/about/ affiliate our homepage http://9to5mac.com/ for all the latest news, and follow 9to5Mac on exclusive stories https://9to5mac.com/feature/exclusive/ , reviews https://9to5mac.com/guides/review/ , how-tos https://9to5mac.com/guides/how-to/ , and subscribe to our YouTube channel https://www.youtube.com/9to5mac